Graphs of non-smooth contact mappings on carnot groups with sub-lorentzian structure

For classes of graph mappings constructed from CH1 -mappings of nilpotent graded groups, we prove area formula on sub-Lorentzian structures of arbitrary depth with multi-dimensional time.

Sufficient maximality conditions for surfaces on two-step sub-lorentzian structures

We deduce sufficient maximality conditions for graph surfaces on two-step Carnot groups with sub-Lorentzian structure.

Area of graph surfaces on Carnot groups with sub-lorentzian structure

For graph mappings constructed from sufficiently smooth mappings of nilpotent graded groups, we prove area formula on sub-Lorentzian structures of arbitrary depth with multi-dimensional time.